linux-kernel - Re: [Regression, post-2.6.35] ath9k occasionally drops out of PCI config space

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 8 Nov 2010 13:06:47 -0800
From:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [Regression, post-2.6.35] ath9k occasionally drops out of PCI
 config space

On Mon, Nov 8, 2010 at 12:47 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Friday, November 05, 2010, Luis R. Rodriguez wrote:
>> On Fri, Nov 05, 2010 at 01:50:02PM -0700, Rafael J. Wysocki wrote:
>> > Hi,
>> >
>> > For some time I've been experiencing a regression associated with ath9k
>> > that occasionally it drops the connection with the AP and goes into a state
>> > in which reading from its PCI config registers (as done by lspci) return all
>> > ones.
>> >
>> > It may be sort of brought back to life by a suspend/resume afterwards, but
>> > then the driver cannot really handle it and realoding the driver doesn't help
>> > (probe fails).  Basically, full machine reboot is needed to revive the adapter.
>> >
>> > The device is:
>> >
>> > 09:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)
>> >         Subsystem: Foxconn International, Inc. Device e01f
>> >
>> > and the kernel says:
>> >
>> > [    9.623217] ath9k 0000:09:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
>> > [    9.631518] ath9k 0000:09:00.0: setting latency timer to 64
>> > [   10.071497] ath: EEPROM regdomain: 0x65
>> > [   10.071502] ath: EEPROM indicates we should expect a direct regpair map
>> > [   10.071510] ath: Country alpha2 being used: 00
>> > [   10.071514] ath: Regpair used: 0x65
>> > [   10.096025] phy0: Selected rate control algorithm 'ath9k_rate_control'
>> > [   10.097803] Registered led device: ath9k-phy0::radio
>> > [   10.098035] Registered led device: ath9k-phy0::assoc
>> > [   10.098249] Registered led device: ath9k-phy0::tx
>> > [   10.098483] Registered led device: ath9k-phy0::rx
>> > [   10.098496] phy0: Atheros AR9280 Rev:2 mem=0xffffc900017e0000, irq=19
>> >
>> > The issue is not really bisectable, because I'm unable to trigger it on demand
>> > and it occurs approx. 1-2 times a day.  So, if you have any ideas what to test,
>> > please let me know.
>> >
>> > It is not reproducible with the 2.6.35 kernel.
>>
>> Please try this patch.
>
> It _appears_ to help.  At least I haven't been able to reproduce the problem
> since I applied it, which was on Saturday early in the morning.
>
> Still, I also haven't used wireless a lot since that time, because I've been
> traveling mostly.

Thanks, please let us know when you are satisfied with this as a fix.
Its going upstream so either way if you find you hit the issue just
let us know.

  Luis
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/